The “highest level of education successfully completed” should be definitely modified into terms which can be understand by anyone(primary school, high school, bachelors, phd, etc..).. I had no idea what to choose there

RubenBristian said
The “highest level of education successfully completed” should be definitely modified into terms which can be understand by anyone(primary school, high school, bachelors, phd, etc..).. I had no idea what to choose there

I know this one is tricky!

Due to the fact that people all over the world can answer this questionnaire I had to standardize the education.

There is only one classification that covers all different education systems :

ISCED – International Standard Classification of Education

Here you will find more details about the classification of the different countries.